GC seems to crash my C-code function

[frame]

On Thursday, 16 September 2021 at 18:02:44 UTC, Steven 
Schveighoffer wrote:

> Are you sure? Be very pedantic about what C functions do with 
> the data you send it. Sometimes they store it somewhere to use 
> later. Sometimes they expect it to be allocated by the C heap, 
> etc.
>
> Without seeing how you use it, I can't tell you if it's wrong 
> or not.

If you want to have a look the original C-library is here
https://github.com/rdoeffinger/iec16022

I'm only using the encoder function iec16022ecc200f.

>
> If it's a literal, you don't need to toStringz (which also 
> allocates). All string literals are zero-terminated (and 
> actually implicitly castable to `immutable char *`).
>
> -Steve

Thanks, I'm just careful with casting.
Does it really allocate from a literal if it's used on the stack 
only? Is `-vgc` switch reliable?